Number of found documents: 318
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The deposition of germanium nanoparticles on hydrogenated amorphous silicon.
Stuchlík, J.; Volodin, V.A.; Shklyaev, A.A.; Stuchlikova, T.H.; Ledinsky, M.; Čermák, J.; Kupčík, Jaroslav; Fajgar, R.; Mortet, V.; More-Chevalier, J.; Ashcheulov, P.; Purkrt, A.; Remeš, Z.
2017 - English
We reveal the mechanism of Ge nanoparticles (NPs) formation on the surface of the hydrogenated amorphous silicon (a-Si:H) deposited by Plasma Enhanced Chemical Vapor Deposition (PECVD) on ITO and a on boron doped nanocrystalline diamond (BDD). The coating of Ge NPs on a-Si:H was performed by molecular beam epitaxy (MBE) at temperatures up to 450 degrees C. The Ge NPs were characterized by Raman spectroscopy, scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). The nanocrystalline Ge particles are conglomerates of nanocrystals of size 10-15 nm and quantum dots (QDs) with size below 2 nm embedded in amorphous Ge phase. After coating with Ge NPs the a-Si:H thin films show better adhesion on BDD substrates then on ITO substrates. Keywords: Ge nanoparticles; a-Si:H; PECVD; MBE Available at various institutes of the ASCR
The deposition of germanium nanoparticles on hydrogenated amorphous silicon.

We reveal the mechanism of Ge nanoparticles (NPs) formation on the surface of the hydrogenated amorphous silicon (a-Si:H) deposited by Plasma Enhanced Chemical Vapor Deposition (PECVD) on ITO and a on ...

Stuchlík, J.; Volodin, V.A.; Shklyaev, A.A.; Stuchlikova, T.H.; Ledinsky, M.; Čermák, J.; Kupčík, Jaroslav; Fajgar, R.; Mortet, V.; More-Chevalier, J.; Ashcheulov, P.; Purkrt, A.; Remeš, Z.
Ústav anorganické chemie, 2017

The origin issue of the head of John the Baptist from Tajov
Hradilová, J.; Bezúchová, E.; Hradil, David; Šídová, K.
2017 - English
The significant work of art, the Head of John the Baptist from Tajov, from the Museum of Central Slovakia in Banska Bystrica, which is probably part of the works of Niclaus Gerhaert von Leiden (1420/30 - 1475), was subject to conservation as well as detailed material analysis - first using non-invasive methods (radiography computer tomography, X-ray fluorescence), then laboratory analysis of taken samples (elemental and phase analysis, analysis of organic binders, dendrochronology, radiocarbon dating). The specific painting technique was described. Gilding of the head was performed without any ground only on brown preparatory layer for oil gilding (mixtion), however, the incarnates with an oily binder did contain a light dolomitic ground layer. The blood drops painting employed madder lake including sheep wool shearlings. The work consists of two parts - the head and the bowl, which was understood not to be original. Both parts are made from poplar wood. The results of the dating indicate that the head was created in the second half of the 15th century. The bowl could have been added later, but no later than the beginning of the 16th century. Its inclusion may have happened (albeit it is less probable) in the 17th century, but any period of time after that can be ruled out. The original colouring of the bowl was different the earth pigments of specific composition used in the ground layer imitated terracotta - a clay bowl. Based on the location of the existing hanging points the head was probably on display occasionally in a vertical position with a slight bottom view of 45 degrees. Keywords: Niclaus Gerhaert von Leiden; non-invasive analysis; painting technique; radiocarbon dating Available at various institutes of the ASCR
The origin issue of the head of John the Baptist from Tajov

The significant work of art, the Head of John the Baptist from Tajov, from the Museum of Central Slovakia in Banska Bystrica, which is probably part of the works of Niclaus Gerhaert von Leiden ...

Hradilová, J.; Bezúchová, E.; Hradil, David; Šídová, K.
Ústav anorganické chemie, 2017

Rebecca and Eliezer at the well a mysterious oil painting from the Historical Museum of the Slovak National Museum at the Bratislava Castle
Hradilová, J.; Kližanová, H.; Bezák, M.; Holcová, K.; Bezdička, Petr
2017 - English
Light microscopy, scanning electron microscopy and microanalysis, X-ray powder micro-diffraction, infrared micro-spectrometry as well as palaeontological analysis have been applied in order to solve the question of provenance of the oil-on-canvas painting Rebecca and Eliezer at the well. In addition to the finding of pigments important for the dating of the painting, as, e.g. Naples yellow (Pb2Sb2O7), or smalt, fossil nannoplankton was described in the carbonate-rich clay ground. It indicates the use of marine sediments of Eocene to Oligocene age. According to mineralogical and paleontological data this ground may be included among grounds used in Italy, particularly in the 17th century. The studied painting is today greatly altered due to extensive reworkings. Prussian blue was used to overpaint faded ultramarine and degraded smalt, which is visibly affected by saponification processes. Keywords: Carlo Maratta/Maratti; materials research; painting technique; micropaleontology; clay-based grounds; saponification Available at various institutes of the ASCR
Rebecca and Eliezer at the well a mysterious oil painting from the Historical Museum of the Slovak National Museum at the Bratislava Castle

Light microscopy, scanning electron microscopy and microanalysis, X-ray powder micro-diffraction, infrared micro-spectrometry as well as palaeontological analysis have been applied in order to solve ...

Hradilová, J.; Kližanová, H.; Bezák, M.; Holcová, K.; Bezdička, Petr
Ústav anorganické chemie, 2017

Generation of NPS for Exposure Experiments from Copper Acetylacetone.
Moravec, P.; Schwarz, J.; Vodička, P.; Kupčík, Jaroslav; Švehla, J.
2016 - English
Particles containing copper are emitted from smelters, iron foundries, power stations, and municipal incinerators (WHO, 1998) and also from brake linings during breaking, Kukutschová et al. (2011). Nanoparticles (NPs) of copper are ingredients in polymers, inks, and bioactive coatings inhibiting the growth of microorganisms, Cioffi at al. (2005), and CuO NPs has been used in antimicrobial textiles, Gabbay and Borkow (2006), therefore they can be easily inhaled. Even though CuO NPs were found highly toxic, Karlsson et al. (2008), in vivo studies of their toxicity are still rather rare. In this work we tested a method of long lasting nanoparticle generation from copper acetylacetonate (CuAA) for use in follow up exposure experiments with laboratory animals. The exposure chamber for inhalation experiments was constructed in the Institute of Analytical Chemistry AS CR (Večeřa et al., 2011) and some methods of NPs generation for these experiments were already tested in our laboratory (Moravec et al., 2015, Moravec et al., 2016). Keywords: copper acetylacetonate; hot wall reactor; nanoparticle generation Fulltext is available at external website.
Generation of NPS for Exposure Experiments from Copper Acetylacetone.

Particles containing copper are emitted from smelters, iron foundries, power stations, and municipal incinerators (WHO, 1998) and also from brake linings during breaking, Kukutschová et al. (2011). ...

Moravec, P.; Schwarz, J.; Vodička, P.; Kupčík, Jaroslav; Švehla, J.
Ústav anorganické chemie, 2016

Sorption properties of graphen oxide and styrene composites for SR-85 and CS-137
Brynych, V.; Kolářová, M.; Pospěchová, J.; Tolasz, Jakub; Štengl, Václav
2015 - English
In the presented work, new composite nanomaterials, based on graphene oxide and styrene, have been developed for the retention purpose. Sr-85 and Cs-137 represent two of the main fission products being present in radioactive wastes from nuclear power cycle. The graphene oxide samples were prepared from natural graphite using high intensity cavitation field in a pressurized (6 bar) batch-ultrasonic reactor. Graphene oxide polystyrene composite was synthesized using direct emulsion polymerization of styrene in the presence of graphene oxide at 90 degrees C. The basic method used for the evaluation of nanomaterial retention properties was batch sorption methodology, based on a contact of solid material with a tracer solution under defined boundary conditions (solid/solution ratio, time, solution composition as pH and ionic strength). Keywords: Graphene oxide; Radionuclides; Sorption Available at various institutes of the ASCR
Sorption properties of graphen oxide and styrene composites for SR-85 and CS-137

In the presented work, new composite nanomaterials, based on graphene oxide and styrene, have been developed for the retention purpose. Sr-85 and Cs-137 represent two of the main fission products ...

Brynych, V.; Kolářová, M.; Pospěchová, J.; Tolasz, Jakub; Štengl, Václav
Ústav anorganické chemie, 2015

Antimicrobial activity of cobalt bis(dicarbollide) aminoderivatives
Kvasničková, E.; Masák, J.; Šícha, Václav
2015 - English
We carried out experiments focused on the determination of the antimicrobial acitivity of selected representatives of cobalt bis{dicarbollide) aminoderivates. lt was proved, that studied yeast strain C. parapsilosis DBM 2165 is not sensitive to the cobalt bis{dicarbollide) or its aminoderivatives. Gram-negative bacteria P. aeruginosa B-59188 is weakly susceptive to cobalt bis(dicarbollide), but no significant inhibition of growth by cobalt bis(dicarbollide) aminoderivatives was observed. The highest effect on inhibition of microbial growth was confirmed in the case of gram-positive bacteria 5. aureus. This observation demonstrates the real possibility of using these substances in the treatment of infection caused by gram-positive bacterial strains. Keywords: cobalt bis(dicarbollide); aminoderivatives; antimicrobial activity Available at various institutes of the ASCR
Antimicrobial activity of cobalt bis(dicarbollide) aminoderivatives

We carried out experiments focused on the determination of the antimicrobial acitivity of selected representatives of cobalt bis{dicarbollide) aminoderivates. lt was proved, ...

Kvasničková, E.; Masák, J.; Šícha, Václav
Ústav anorganické chemie, 2015

Tuning the Photophysical Properties of Anti-B18H22 [1]
Braborec, Jakub; Černá, H.; Benkocká, M.; Kolská, Z.; Londesborough, Michael Geoffrey Stephen
2015 - English
The tuning of the photophysical properties of the highly fluorescent boron hydride cluster anti-B18H22 (1), by straight-forward chemical substitution to produce 4,4'-(HS)(2)-anti-B18H20 (2), facilitates intersystem crossing from excited singlet states to a triplet manifold.[1] This subsequently enhances O-2((1)Delta(g)) singlet oxygen production from a quantum yield of Phi(Delta) similar to 0.008 in 1 to 0.59 in 2. This contribution describes the synthesis and full structural characterization of the new compound 4,4'-(HS) 2-anti-B18H20 (2) and uses UV-vis spectroscopy coupled with DFT and ab initio computational studies to delineate and explain its photophysical properties. Additionally, we will report on new fluorescent derivatives of anti-B18H22 and their immobilisation on solid nanostructured substrates. Keywords: borane hydrides; singlet oxygen; fluorescent boranes Available at various institutes of the ASCR
Tuning the Photophysical Properties of Anti-B18H22 [1]

The tuning of the photophysical properties of the highly fluorescent boron hydride cluster anti-B18H22 (1), by straight-forward chemical substitution to produce 4,4'-(HS)(2)-anti-B18H20 (2), ...

Braborec, Jakub; Černá, H.; Benkocká, M.; Kolská, Z.; Londesborough, Michael Geoffrey Stephen
Ústav anorganické chemie, 2015

Průzkum Madony Cestovního oltáříku Roberta z Anjou ze sbírek Moravské galerie v Brně
Fogaš, I.; Wörgötter, Z.; Hradilová, J.; Hradil, David; Zikmund, T.; Kaiser, J.
2014 - Czech
Mimořádné gotické dílo, cestovní Oltářík Roberta z Anjou je jedním z těch, jimiž Jan II. z Liechtenštejna obdaroval roku 1896 Františkovo museum v Brně. Nově však byly objasněny okolnosti knížecí akvizice, které vyvrátily úvahy o středoevropské provenienci oltáříku, neboť je dokladováno, že nákup byl proveden přímo ve Florencii v roce 1890. Již tehdy byl zaznamenán i fakt, že tabernákl je opatřen (poškozenou) soškou Černé Madony z kararského mramoru. Popis jejího poškození, druhotných doplňků a výstavby polychromie byl hlavním cílem výzkumu díla neinvazivními metodami (mobilní XRF, počítačová tomografie), na základě jejich výsledků pak byl uskutečněn i šetrný odběr mikrovzorků a materiálový rozbor. Bylo zjištěno především, že materiálem sochy není kararský mramor, ale alabastr, což sice není v rozporu s předpokládanou proveniencí (severní Itálie), těžko však pro svoji hmotnost a křehkost mohla být soška původní součástí Oltáříku. Rovněž analýza nejstarších vrstev polychromie prokázala, že Madona původně nebyla černá a že tato úprava byla provedena druhotně a záměrně. An exceptional Gothic work of art, a travel altar of Robert of Anjou, is one of those donated by John II of Liechtenstein to the Franz Museum in Brno in 1896. Light has been newly shed on the circumstances of Prince's acquisition of the altar; it refuted the thoughts about the altar's Central European provenance, because as it is being documented, the purchase took place directly in Florence in 1890. It has been recorded already back then that the Tabernacle is complemented by a (damaged) statuette of Black Madonna made of Carrara marble. The description of its damage, secondary additions and polychromy construction was the main aim of the artwork's survey by non-invasive methods (mobile XRF, computed tomography); on the basis of their results, a careful micro-sampling has been performed followed by material analysis. Most importantly, it was found out that the material of the statue is not Carrara marble, but an alabaster, which is not in disagreement with the assumed provenance (northern Italy), but due to its weight and fragility, the statuette could only hardly be an original part of the altar. Concurrently, the analysis of the oldest layers of polychromy proved that the Madonna has not been originally black and that this adjustment has been executed secondarily and intentionally. Keywords: Black Madonna; travel altar,; alabaster; Gothic art; Florence; Liechtenstein Available at various institutes of the ASCR
Průzkum Madony Cestovního oltáříku Roberta z Anjou ze sbírek Moravské galerie v Brně

Mimořádné gotické dílo, cestovní Oltářík Roberta z Anjou je jedním z těch, jimiž Jan II. z Liechtenštejna obdaroval roku 1896 Františkovo museum v Brně. Nově však byly objasněny okolnosti knížecí ...

Fogaš, I.; Wörgötter, Z.; Hradilová, J.; Hradil, David; Zikmund, T.; Kaiser, J.
Ústav anorganické chemie, 2014

Investigation of Madonna in the travel altar of Robert of Anjou from the collection of moravian gallery in Brno
Fogaš, I.; Wörgötter, Z.; Hradilová, J.; Hradil, David; Zikmund, T.; Kaiser, J.
2014 - English
An exceptional Gothic work of art, a travel altar of Robert of Anjou, is one of those donated by John II of Liechtenstein to the Franz Museum in Brno in 1896. Light has been newly shed on the circumstances of Prince's acquisition of the altar; it refuted the thoughts about the altar's Central European provenance, because as it is being documented, the purchase took place directly in Florence in 1890. It has been recorded already back then that the Tabernacle is complemented by a (damaged) statuette of Black Madonna made of Carrara marble. The description of its damage, secondary additions and polychromy construction was the main aim of the artwork's survey by non-invasive methods (mobile XRF, computed tomography); on the basis of their results, a careful micro-sampling has been performed followed by material analysis. Most importantly, it was found out that the material of the statue is not Carrara marble, but an alabaster, which is not in disagreement with the assumed provenance (northern Italy), but due to its weight and fragility, the statuette could only hardly be an original part of the altar. Concurrently, the analysis of the oldest layers of polychromy proved that the Madonna has not been originally black and that this adjustment has been executed secondarily and intentionally. Keywords: Black Madonna; travel altar,; alabaster; Gothic art; Florence; Liechtenstein Available at various institutes of the ASCR
Investigation of Madonna in the travel altar of Robert of Anjou from the collection of moravian gallery in Brno

An exceptional Gothic work of art, a travel altar of Robert of Anjou, is one of those donated by John II of Liechtenstein to the Franz Museum in Brno in 1896. Light has been newly shed on the ...

Fogaš, I.; Wörgötter, Z.; Hradilová, J.; Hradil, David; Zikmund, T.; Kaiser, J.
Ústav anorganické chemie, 2014

Anti-B18H22: A Brand-New Laser Material
Cerdán, L.; Braborec, Jakub; Garcia-Moreno, I.; Costela, A.; Londesborough, Michael Geoffrey Stephen
2014 - English
The first laser borane, anti-B18H22, exhibits blue laser emission at 406nm with an efficiency of 9.5 % and a photostability superior to that of commercial laser dyes, providing a new solution to an old problem. Keywords: Laser excitation; Measurement by laser beam; Chemical lasers Available at various institutes of the ASCR
Anti-B18H22: A Brand-New Laser Material

The first laser borane, anti-B18H22, exhibits blue laser emission at 406nm with an efficiency of 9.5 % and a photostability superior to that of commercial laser dyes, providing a new solution to an ...

Cerdán, L.; Braborec, Jakub; Garcia-Moreno, I.; Costela, A.; Londesborough, Michael Geoffrey Stephen
Ústav anorganické chemie, 2014

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